linux-kernel - Re: more iommu sg merging fallout

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Message-Id: <20080219195758V.fujita.tomonori@lab.ntt.co.jp>
Date:	Tue, 19 Feb 2008 19:57:58 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	davem@...emloft.net
Cc:	tomof@....org, fujita.tomonori@....ntt.co.jp,
	jens.axboe@...cle.com, linux-kernel@...r.kernel.org
Subject: Re: more iommu sg merging fallout

On Sun, 17 Feb 2008 23:41:42 -0800 (PST)
David Miller <davem@...emloft.net> wrote:

> From: FUJITA Tomonori <tomof@....org>
> Date: Sat, 16 Feb 2008 15:03:43 +0900
> 
> > [PATCH] sparc64: make IOMMU code respect the segment boundary limits
> > 
> > Signed-off-by: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
> 
> Looks good, but I think it will break sound for some ALI chips.
> 
> Please see arch/sparc64/kernel/pci.c:ali_sound_dma_hack()
> and it's caller pci_dma_supported().

Could you explain the problem a little more?

The shift argument is only used as an offset when iommu-helper decides
whether a memory area (index plus npages) spanning LLD's segment
boudnary size or not.

For example, if a device's segment boudary size is 64K, the helper see
the following value is larger than 64K or not:

((the offset + index of the IOMMU table) ((64K / 8K) - 1) + npages
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